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Be cautious travelling in Mumbai: Bishop

Foreign minister Julie Bishop says the warning of a possible terrorist attack in India hasn't been verified by Australian authorities.

It comes as the Department of Foreign Affairs on Tuesday warned Australian travellers that terrorists may be planning attacks in Indonesia following US government warnings.

Those heading to Indonesia have been advised to exercise a high degree of caution, especially in Bali and Surabaya.

Ms Bishop said the level was updated with advice from Australia's security and intelligence agencies and diplomats that "are on the ground".

In updated travel advice from India regarding surrogacy arrangements on Wednesday, it noted that December 2014 information about militants planning attacks against upmarket hotels in Mumbai is still under investigation.

Australians travelling have been reminded to exercise a high degree of caution in India due to the high threat of terrorist activity, civil unrest, crime and the high rate of vehicle accidents, said DFAT.

"Not all of it has been verified independently by the Australian security agencies.

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"That's the view of the Indian authorities," Ms Bishop told Macquarie Radio on Wednesday.

"We haven't been able to independently verify that so we haven't changed the overall threat level, which is to continue to exercise a high degree of caution - but we have provided the information from the Indian authorities.

"That doesn't mean you don't go to Mumbai, it just means you've got to be very cautious," she said.

Ms Bishop said Australians should always be cautious travelling overseas, and advised them to regularly check the Smart Traveller website.

Some Australians will no longer be able to enter India to make surrogacy arrangements.

The decision affects women in NSW, Queensland and the ACT where overseas commercial surrogacy is illegal.

India already required a medical visa for such purposes, but now has a limited ban in place.

In practice that means residents of the two states and the ACT will not be permitted to enter into surrogacy arrangements in India, the Department of Foreign Affairs says.

It is possible that India will make further changes to its surrogacy policy in 2015 which could affect residents in other Australian states, it said in an updated travel advice.

DFAT recommends that Australians contemplating surrogacy contact the appropriate Indian mission in Australia for advice.